The law says
IRPR r. 322(1)The first review of reasons, after the coming into force of this section, for the continued detention of a person detained under the former Act shall be made in accordance with the provisions of the former Act.
Period of detention
(2)If the review referred to in subsection (1) was the first review in respect of a person’s detention, the period of detention at the end of which that review was made shall be considered the period referred to in subsection 57(1) of the Immigration and Refugee Protection Act.
Subsequent review
(3)If a review of reasons for continued detention follows the review referred to in subsection (1), that review shall be made under the Immigration and Refugee Protection Act.
Provisions this one cites
IRPA Authority
Justice Laws is the authoritative version. If this copy and it ever differ, Justice Laws wins.